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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations $ 994.8 $ 1,274.6
INVESTING ACTIVITIES    
Additions to property and equipment (255.5) (1,445.8)
Purchase of Affiliate Debt 0.0  
Maturities of short-term investments 1,582.0 757.3
Purchases of short-term investments (1,704.0) (850.0)
Other 7.7 1.4
Net cash used in investing activities of continuing operations (369.8) (1,537.1)
FINANCING ACTIVITIES    
Proceeds from equity issuance 585.5 0.0
Proceeds from Issuance of Senior Long-term Debt 0.0 1,078.7
Cash dividends paid (8.5) (105.9)
Payments for Advance to Affiliate 0.0  
Reduction of long-term borrowings (862.4) (1,072.5)
Debt financing costs 0.0 (10.5)
Advances from (to) affiliates   0.0
Premium paid on redemption of debt 0.0 (30.3)
Other (2.3) (8.4)
Net cash used in financing activities (287.7) (148.9)
DISCONTINUED OPERATIONS    
Operating activities 1.2 (12.7)
Investing activities 6.2 (0.3)
Net cash provided by (used in) discontinued operations 7.4 (13.0)
Effect of exchange rate changes on cash and cash equivalents (0.6) 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 344.1 (424.4)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 121.3 664.8
CASH AND CASH EQUIVALENTS, END OF PERIOD 465.4 240.4
Ensco Plc [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations 150.4 (34.2)
INVESTING ACTIVITIES    
Additions to property and equipment 0.0  
Purchase of Affiliate Debt (237.9)  
Maturities of short-term investments 1,582.0 712.0
Purchases of short-term investments (1,282.0) (850.0)
Net cash used in investing activities of continuing operations 62.1 (138.0)
FINANCING ACTIVITIES    
Proceeds from equity issuance 585.5  
Proceeds from Issuance of Senior Long-term Debt   1,078.7
Cash dividends paid (8.5) (105.9)
Reduction of long-term borrowings (862.4) (1,072.5)
Debt financing costs   (10.5)
Advances from (to) affiliates (156.1) (175.0)
Premium paid on redemption of debt   (30.3)
Other (2.0) (5.2)
Net cash used in financing activities (131.3) 29.3
DISCONTINUED OPERATIONS    
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 81.2 (142.9)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 94.0 287.4
CASH AND CASH EQUIVALENTS, END OF PERIOD 175.2 144.5
ENSCO International Inc. [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations (23.6) (7.1)
INVESTING ACTIVITIES    
Additions to property and equipment 0.0 0.0
Purchases of short-term investments   0.0
Other 0.0 0.0
Net cash used in investing activities of continuing operations 0.0 0.0
FINANCING ACTIVITIES    
Proceeds from equity issuance 0.0  
Proceeds from Issuance of Senior Long-term Debt   0.0
Cash dividends paid 0.0 0.0
Reduction of long-term borrowings 0.0 0.0
Debt financing costs   0.0
Advances from (to) affiliates (23.6) (7.2)
Premium paid on redemption of debt   0.0
Other 0.0 0.0
Net cash used in financing activities 23.6 7.2
DISCONTINUED OPERATIONS    
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 0.0 0.1
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 0.0 0.0
CASH AND CASH EQUIVALENTS, END OF PERIOD 0.0 0.1
Pride International, Inc. [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations (95.3) (86.1)
INVESTING ACTIVITIES    
Purchase of Affiliate Debt 0.0  
Purchases of short-term investments   0.0
Net cash used in investing activities of continuing operations 0.0 0.0
FINANCING ACTIVITIES    
Proceeds from equity issuance 0.0  
Proceeds from Issuance of Senior Long-term Debt   0.0
Cash dividends paid 0.0 0.0
Reduction of long-term borrowings 0.0 0.0
Debt financing costs   0.0
Advances from (to) affiliates (114.1) (9.9)
Premium paid on redemption of debt   0.0
Other 0.0 0.0
Net cash used in financing activities 114.1 9.9
DISCONTINUED OPERATIONS    
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 18.8 (76.2)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 2.0 90.8
CASH AND CASH EQUIVALENTS, END OF PERIOD 20.8 14.6
Other Non-Guarantor Subsidiaries Of Ensco [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations 963.3 1,402.0
INVESTING ACTIVITIES    
Additions to property and equipment (255.5) (1,445.8)
Purchase of Affiliate Debt 0.0  
Maturities of short-term investments 0.0 45.3
Purchases of short-term investments (422.0) 0.0
Other 7.7 1.4
Net cash used in investing activities of continuing operations (669.8) (1,399.1)
FINANCING ACTIVITIES    
Proceeds from equity issuance 0.0  
Proceeds from Issuance of Senior Long-term Debt   0.0
Cash dividends paid 0.0 0.0
Payments for Advance to Affiliate (293.8) (192.1)
Reduction of long-term borrowings   0.0
Proceeds from (Repayments of) Debt 237.9  
Debt financing costs   0.0
Premium paid on redemption of debt   0.0
Other (0.3) (3.2)
Net cash used in financing activities (56.2) (195.3)
DISCONTINUED OPERATIONS    
Operating activities 1.2 (12.7)
Investing activities 6.2 (0.3)
Net cash provided by (used in) discontinued operations 7.4 (13.0)
Effect of exchange rate changes on cash and cash equivalents (0.6) 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 244.1 (205.4)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 25.3 286.6
CASH AND CASH EQUIVALENTS, END OF PERIOD 269.4 81.2
Consolidating Adjustments [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations 0.0  
INVESTING ACTIVITIES    
Purchase of Affiliate Debt 237.9  
Net cash used in investing activities of continuing operations 237.9 0.0
FINANCING ACTIVITIES    
Proceeds from equity issuance 0.0  
Proceeds from Issuance of Senior Long-term Debt   0.0
Cash dividends paid 0.0 0.0
Payments for Advance to Affiliate 0.0  
Reduction of long-term borrowings (237.9) 0.0
Debt financing costs   0.0
Advances from (to) affiliates   0.0
Premium paid on redemption of debt   0.0
Other 0.0 0.0
Net cash used in financing activities $ (237.9) $ 0.0